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Super guar gum foamed fracturing fluid injected with liquid nitrogen for low-permeability gas reservoir and preparation method thereof

A technology of foam fracturing fluid and super guar gum, which is applied in the field of fracturing fluid, can solve the problems of low thickener residue content, high residue content, and difficult flowback, etc., achieve good swelling performance, low residue content, increase formation energy effect

Active Publication Date: 2013-07-31
CNPC XIBU DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides super guar gum foam fracturing fluid with liquid nitrogen injection for low-permeability gas reservoirs and its preparation method, which overcomes the deficiencies in the prior art and solves the problem of using conventional hydroxypropyl guar gum fracturing hydraulic pressure for low-pressure and low-permeability gas reservoirs. The problem of high residue content after cracking and difficult flowback, the thickener residue content is low, foam stability is good, sand-carrying performance is strong, shear stability is good within 110°C, gel breaking is thorough, and flowback is fast, which can be very good Satisfies the fracturing requirements of low-permeability gas reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1, the super guar gum foam fracturing fluid injected with liquid nitrogen in the low-permeability gas reservoir is uniformly mixed according to the volume ratio of base fluid and cross-linking fluid to 100:0.6 to obtain a mixture of base fluid and cross-linking fluid, that is, a semi-finished product. Super guar gum foam fracturing fluid injected with liquid nitrogen in gas permeable reservoirs; among them, the base fluid consists of 0.5% super guar gum, 0.025% dispersant, 0.3% anti-swelling agent, 0.5% drainage aid, foaming 0.5% of agent, KCl1.0%, 0.1% of bactericide, 0.1% of pH adjuster, 0.15% of temperature stabilizer and the rest of water, citric acid or acetic acid is used as dispersant, and small molecular weight of 300 to 800 is used as anti-swelling agent. Cationic polymer, the drainage aid uses a fluorocarbon surfactant compound that can significantly reduce the surface tension of air and water, and the foaming agent uses polyoxyethylene lauryl ether, po...

Embodiment 2

[0025] Example 2, the difference from Example 1 is that in Example 2, a breaker and liquid nitrogen are added to the mixture of the base liquid and the cross-linking liquid, and the flow rate is from 150 liters / minute to 200 liters / minute Pump liquid nitrogen into the mixture of base liquid and cross-linking liquid, and add 0.005% to 0.09% of gel breaker to the mixture of cross-linking liquid according to the weight percentage of the mixture of base liquid and cross-linking liquid, that is, the on-site construction The liquid nitrogen used in low-permeability gas reservoirs is accompanied by injection of super guar foam fracturing fluid.

Embodiment 3

[0026] Embodiment 3, the super guar foam fracturing fluid injected with liquid nitrogen in the low-permeability gas reservoir of the above-mentioned embodiment 1 is obtained through the following steps:

[0027] The first step is to prepare the base liquid: add the required amount of water to the base liquid mixing tank, first add the required amount of fungicide and KCl to the base liquid mixing tank, and then add the required amount of super guar gum and dispersant, after it swells, add the required amount of anti-swelling agent, drainage aid, foaming agent, temperature stabilizer and mix evenly, and finally add the required amount of pH regulator and mix evenly, and it is completed Preparation of base liquid;

[0028] The second step is to prepare the cross-linking liquid: add the required amount of water into the cross-linking liquid mixing tank, then add the required amount of cross-linking agent in the cross-linking liquid mixing tank and mix evenly to complete the cross...

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Abstract

The invention relates to the technical field of fracturing fluid used in a compression fracture yield increasing process of an oil well or a natural gas well, in particular relating to super guar gum foamed fracturing fluid injected with liquid nitrogen for a low-permeability gas reservoir. The preparation method of the super guar gum foamed fracturing fluid comprises the following steps: homogeneously mixing a base solution with a crosslinking solution to obtain a semi-finished product of the super guar gum foamed fracturing fluid; and adding a viscosity breaking agent and injecting liquid nitrogen into the semi-finished product to obtain the super guar gum foamed fracturing fluid injected with liquid nitrogen for on-site construction. The super guar gum foamed fracturing fluid provided by the invention has the advantages of good swelling capacity, stable nature of foam, low content of fracturing fluid residue and good viscosity breaking performance, and can be used for reducing the damage to reservoir bed, increasing the strata energy after fracturing, and improving the flowback efficiency.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid used in the fracturing and stimulation process of oil wells or natural gas wells, and is a fracturing fluid for low-permeability gas reservoirs accompanied by injection of super guar gum foam. Background technique [0002] At present, hydraulic fracturing is the main means of stimulation for low-permeability gas reservoirs. Fracturing fluid is the working fluid in the process of hydraulic fracturing to transform oil and gas layers. The fracturing fluid provides a means for hydraulic fracturing operations. After forming formation fractures, carrying proppant deep into artificial fractures and fracturing, chemical decomposition or gel breaking to low viscosity ensures that most of the fracturing fluid is flowed back to the ground to purify the fractures. In view of the characteristics of low-permeability gas reservoirs and gas wells without pumping units and other equipment, it is very impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/70
Inventor 郑义平陈若铭张兴国乔东宇黄治中王云
Owner CNPC XIBU DRILLING ENG
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